Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):



	Three Months Ended									Three Months Ended
	September 30, 2017									September 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	517,492	$	149,556	$	—		$	667,048	$	473,546	$	155,855	$	—		$	629,401
Gross profit	155,783		62,532		—			218,315		143,681		63,439		—			207,120
Operating income	59,016		16,088		(14,234		)	60,870		53,982		14,429		(13,001		)	55,410
Amortization	7,194		1,054		—			8,248		8,590		1,152		—			9,742



	Nine Months Ended									Nine Months Ended
	September 30, 2017									September 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	1,502,462	$	444,427	$	—		$	1,946,889	$	1,360,424	$	459,105	$	—		$	1,819,529
Gross profit	445,925		183,471		—			629,396		407,990		188,998		—			596,988
Operating income	162,679		39,525		(38,265		)	163,939		144,158		41,045		(41,332		)	143,871
Amortization	21,983		3,028		—			25,011		25,770		4,148		—			29,918


(1)	Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.

Revenue by Type [Table Text Block]

The following table presents revenues by type (in thousands):



	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Assignment	$	634,339	95.1	%	$	596,437	94.8	%	$	1,848,868	95.0	%	$	1,720,312	94.5	%
Permanent placement	32,709		4.9	%	32,964		5.2	%	98,021		5.0	%	99,217		5.5	%
	$	667,048	100.0	%	$	629,401	100.0	%	$	1,946,889	100.0	%	$	1,819,529	100.0	%

Schedule of Revenue by Geographical Areas

The Company operates internationally, with operations mainly in the United States, Europe and Canada. The following table presents revenues by geographic location (in thousands):



	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Domestic	$	632,584	94.8	%	$	599,991	95.3	%	$	1,849,567	95.0	%	$	1,732,594	95.2	%
Foreign	34,464		5.2	%	29,410		4.7	%	97,322		5.0	%	86,935		4.8	%
	$	667,048	100.0	%	$	629,401	100.0	%	$	1,946,889	100.0	%	$	1,819,529	100.0	%